Bill Gates donates $4.6b to charity

Bill Gates has given away $4.6bn ( 3.6bn) to charity in his largest donation since 2000.
He remains the worldand#39;s richest person, despite giving away 64 million shares in Microsoft.
The shares are equivalent to 5 per cent of his total fortune, currently estimated to be $89.9 billion.
Since 1994 Mr Gates, 61, and his wife Melinda have given away a total of $35 billion in cash and stocks to a range of charitable causes.
The donation was made in June but became public on Monday last following the filing of